Datasheet

RL78/L12 CHAPTER 4 PORT FUNCTIONS

R01UH0330EJ0200 Rev.2.00 111

Dec 13, 2013

4.3.7 A/D port configuration register (ADPC)

This register switches the P20/ANI0, P21/AN21 pins to digital I/O of port or analog input of A/D converter.

The ADPC register can be set by an 8-bit memory manipulation instruction.

Reset signal generation sets this register to 00H.

Figure 4-7. Format of A/D Port Configuration Register (ADPC)

Address: F0076H After reset: 00H R/W

Symbol 7 6 5 4 3 2 1 0

ADPC 0 0 0 0 0 0 ADPC1 ADPC0

ADPC1 ADPC0 Analog input (A)/digital I/O (D) switching

ANI1/P21 ANI0/P20

0 0

A A

0 1

D D

1 0

D A

1 1

A A

Cautions 1. Set the port to analog input by ADPC register to the input mode by using port mode

registers 2 (PM2).

2. Do not set the pin set by the ADPC register as digital I/O by the analog input channel

specification register (ADS).

3. When using AV

REFP and AVREFM, set ANI0 and ANI1 to analog input and set the port mode

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